4245-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4245, an AS568-245 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring with an inside diameter of 4.359 in (110.72 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.637 in (117.78 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

The material holds up against petroleum-based oils, many alcohols, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or strong acids are present.

Maintenance and OEM teams specify it across general industrial maintenance, fluid power, and construction equipment.

Order part number HQ4245, sold individually. Nominal inside diameter is listed as 4 3/8 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.